Marine vessel



FIG. 1 is a perspective view illustrating my design for a marine vessel;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a top plan view of the marine vessel with the top removed;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front elevation view thereof; and,

FIG. 8 is a rear elevation view thereof.

The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a marine vessel, as shown and described. 